Method and arrangement for fastening the wires of the shield of a coaxial cable to a contact cone



Nov. 26, 1963 E. B. BORG 3,

METHOD AND ARRANGEMENT FOR FASTENING THE WIRES OF THE SHIELD OF A COAXIAL CABLE TO A CONTACT CONE Filed May 2. 1960 INVENTOR ERIK BERTIL BORG BY D m kqa y/w ATTORNEYS' United States Patent 3,111,746 METHUD AND ARRANGEMENT FOR FASTENING THE WERES @F THE SHEEN) OF A COAXTAL QABLE Ti) A CUNTAQT C(ENE Erik liertil Borg, Vigghyholm, Sweden, assiguor to Svenslta Alttieholaget Gasaccumulator, Lidingo, near Stochhohn, Sweden, a corporation of Sweden Filed May 2, 1960, Ser. No. 26,137 iaims priority, application Sweden June 3, 1959 2 Claims. (Ci. 29-15555) The present invention relates to a method and an arrangement for fastening the wires of the shield of a coaxial cable to a contact cone, which enables this operation to be performed in a swifter and more reliable manner than has been possible with the aid of prior methods. In order to attach the wires of such a shield to a contact cone, the individual wires of the woven shield were usually loosened from the other wires of the shield, whereupon all wires were folded back over the contact cone. The end of the coaxial cable was then mounted with the aid of this contact cone in a connector in such manner that all the wires of the shield were locked between the contact cone and a correspondingly shaped surface of the connector. It was then necessary to adjust all the individual wires of the shield with great accuracy, so that there would, for instance, be no mutually crossing wires between the contact cone and the said surface of the connector. The reason for this was that the standing-wave ratio of the connection would be subject to erratic changes if, for instance, such crossings would occur between the wires of the connection. For this reason, assembling a coaxial connection used to be very time-consuming and in spite of all the precautions taken, one could never be quite certain that the contact would be correctly assembled.

Through the application of the present invention the disadvantages referred to are removed in such a way that the assembling of a coaxial connection can be per-formed very rapidly and with full certainty that the standingwave ratio will not be subject to any erratic variations. In accordance with the invention, rings of tin solder are placed around the wires positioned on the contact cone, whereupon a heated soldering sleeve with an inner surface form corresponding to the outer surface form of t .e contact cone is pressed against the latter so as to solder all of the wires onto the contact cone. An arrangement for performing this method comprises a metallic soldering sleeve with an inner surface form correspond ing to the contact cone and adapted to be inserted into a soldering bit for heating.

The invention will be described below with reference to the attached drawing, which shows in partial section a portion of a soldering bit, the soldering sleeve and the end of a coaxial cable.

Around the end of the coaxial cable :1 is placed a contact cone 2 and the individual wires 3 of the shield of the coaxial cable are folded back over the contact cone in the usual manner. However, in this case it is not necessary to arrange these individual wires to lie without mutual crossings. Above the contact cone and around the insulation 4 of the inner conductor there are placed a pair of rings 5 and 6 of tin solder. A soldering sleeve 7 is placed around the end of the cable. The soldering sleeve is preheated and is loosely inserted into a soldering bit 8. The soldering bit 8 with the sleeve '7 is brought with slight pressure down towards the contact cone 2, which is held in position in a suitable way, whereby the rings of tin solder are made to melt, so that a complete embedding of the wires 3 in the tin and reliable fastening of them to the contact cone is achieved. The soldering bit is then removed. The sleeve is retained with the aid of a suitable pincers and, if possible, is cooled off swiftly in order to solidify the tin as fast as possible. Finally, the sleeve is removed and a slight polish is applied to remove possibly extruded tin with the aid of a file or a knife. A coaxial connector can then be mounted in conventional manner on the end of the cable. The contact cone 2 is then pressed into attachment against a corresponding surface of the coaxial connector. Since all of the wires of the shield are completely embedded in tin, there can be no erratic changes in the standing-wave ratio and, furthermore, there is obtained through the solder fastening of the wires to the contact cone a very effective removal of the pull.

The soldering sleeve I, which may suitably be of aluminium, has an inner surface 9 of a taper which equals that of the surface ill on the contact cone 2 against which the shield wires 3 are placed.

In the soldering process described, one or more rings of tin solder can be used, their number being essentially dependent on the size of the contact cone.

What is claimed is:

1. A method of fastening the wires of the shield of a multiple coaxial conductor cable to a contact cone, comprising the following steps: folding the wires back onto the contact cone, placing at least one ring of solder above the contact cone and around the insulation of the inner conductor, and pressing a heated soldering sleeve having an inner surface of a diameter greater than the ring diameter and corresponding in its form to the outer surface of the contact cone against the latter so as to embed the wires in the solder and to fasten the Wires by soldering onto the contact cone.

2. A method for fastening the shield wires of acoaxial cable having inner and outer conductors to a contact cone, comprising the steps of placing a contact cone around the coaxial cable and thereby providing a margin of cable extending through the contact cone, folding the shield wires of said margin back onto the outer surface of the contact cone, placing at least one ring of solder around the insulation of the inner conductor of said cable, and pressing a heated soldering sleeve having an inner surface of a diameter greater than the diaimeter of the ring and congruous to the outer surface of said cone against the sheld wires and cone, thereby embedding the wires in the solder and fastening said wires to the cone, the outer surface formed by the solder being congruous to the original surface of the cone.

References Cited in the file of this patent UNITED STATES PATENTS 1,819,671 Buccola Aug. 18, 1931 2,173,643 .Moser Sept. 19, 1939 2,379,942 Webber July 10, 1945 2,432,275 Bels Dec. 9, 1947 2,501,616 Robinson Mar. 21, 1950 2,523,638 Tice Sept. 26, 1950 2,673,233 Salisbury Mar. 23, 1954 2,762,025 Melcher Sept. 4, 1956 2,777,894 Arbeiter et a1. Jan. 15, 1957 2,781,785 Davies 1. Feb. 19, 1957 FOREIGN PATENTS 126,282 Germany Aug. 16, 1928v 

1. A METHOD OF FASTENING THE WIRES OF THE SHIELD OF A MULTIPLE COAXIAL CONDUCTOR CABLE TO A CONTACT CONE, COMPRISING THE FOLLOWING STEPS: FOLDING THE WIRES BACK ONTO THE CONTACT CONE, PLACING AT LEAST ONE RING OF SOLDER ABOVE THE CONTACT CONE AND AROUND THE INSULATION OF THE INNER CONDUCTOR, AND PRESSING A HEATED SOLDERING SLEEVE HAVING AN INNER SURFACE OF A DIAMETER GREATER THAN THE RING DIAMETER AND CORRESPONDING IN ITS FORM TO THE OUTER SURFACE OF THE CONTACT CONE AGAINST THE LATTER SO AS TO EMBED THE WIRES IN THE SOLDER AND TO FASTEN THE WIRES BY SOLDERING ONTO THE CONTACT CONE. 